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Method for preparing slow release-type tebuthiuron granular herbicide

A herbicide and slow-release technology, which is applied in the field of preparation of slow-release buthilone herbicide granules, can solve the problems of adverse environmental impact, long half-life, polluted soil surface water and groundwater, etc., and achieves reduction of phytotoxicity and storage and transportation costs Low, safe effect

Inactive Publication Date: 2017-02-08
YANCHENG SOUTH CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tebuthiauron technical appearance is white powder solid, melting point: 162°C, solubility in water is 2.5g / L (25°C), solubility in methanol is 170g / L (25°C), it is a kind of urea herbicide , has good control effects on annual and perennial grasses and broad-leaved weeds, and is mainly used to control grasses and broad-leaved weeds in non-arable land, shrubs in pastures, and grasses and broad-leaved weeds in sugarcane fields; However, due to its relatively good water solubility and long half-life in soil, it can pollute soil, surface water and groundwater, and have adverse effects on the environment

Method used

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  • Method for preparing slow release-type tebuthiuron granular herbicide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 200g of the original drug of buthiuron, dissolve it in 1L of dichloromethane, and prepare a solution of buthiuron in dichloromethane with a concentration of buthiuron of 200g / L; take 350g of expanded vermiculite and 50g of zeolite, and crush them into mixed carrier powder of 20-100 mesh ; Add the mixed carrier powder to the tetrathhiuron dichloromethane solution, stir in a closed reaction vessel at room temperature for 24 hours, and obtain the mixed solution of the tetrathhiuron mixed carrier powder; add 8 g of sodium silicate to the mixed solution of the tetrathhiuron-carrier powder, and continue to stir for 1 hour until mixed evenly; the mixed solution of tetrathhiuron-carrier powder after being uniformly mixed with sodium silicate is subjected to the first vacuum distillation until there is no obvious liquid residue, and passed through a 18-24 mesh sieve to obtain tetrabuthiuron-carrier powder particles; tetrathhiuron-carrier The powder granules were dried for th...

Embodiment 2

[0028] Take 60g of the original drug of buthiuron, dissolve it in 1L of acetone, and prepare a solution of buthiuron in acetone with a concentration of buthiuron of 60g / L; take 540g of expanded vermiculite and 60g of zeolite, and grind them into 100-200 mesh mixed carrier powder; mix the mixed carrier powder Add to the tetrathhiuron-acetone solution, stir in a closed reaction container at room temperature for 10 hours to obtain the tetrathhiuron-mixed carrier powder mixture; add 10 g of hydroxypropyl cellulose to the tetrathhiuron-carrier powder mixture, and continue to stir for 6 hours until the mixture is uniform; After being evenly mixed with hydroxypropyl cellulose, the tetrathhiuron-carrier powder mixture was distilled under reduced pressure for the first time until there was no obvious liquid residue, and passed through a 18-24 mesh sieve to obtain tetrathhiuron-carrier powder particles; The organic solvent was removed by drying under reduced pressure for the second time ...

Embodiment 3

[0030] Take 105g of the original drug of buthiuron, dissolve it in 1L of methanol, and prepare a buthiuron methanol solution with a concentration of buthiuron of 105g / L; take 570g of expanded vermiculite and 30g of zeolite, and pulverize them into a mixed carrier powder of 200-325 meshes; mix the carrier powder Add the tetrathhiuron methanol solution, and stir in a closed reaction vessel at normal temperature for 12 hours to obtain the tetrathhiuron-mixed carrier powder mixture; add 12 g of microcrystalline cellulose to the tetrathhiuron-carrier powder mixture, and continue to stir for 5 hours until the mixture is uniform; After the microcrystalline cellulose is evenly mixed, the tetrathhiuron-carrier powder mixed solution is subjected to the first vacuum distillation until no obvious liquid remains, and passed through a 18-24 mesh sieve to obtain the tetrathhiuron-carrier powder particles; the tetrathhiuron-carrier powder particles are subjected to the second The organic solve...

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Abstract

The invention belongs to the field of pesticide, and especially relates to a method for preparing a slow release-type tebuthiuron granular herbicide. The method comprises the following steps: dissolving tebuthiuron in a lower boiling organic solvent; taking expanded vermiculite and zeolite, crushing the materials to mixed carrier powder with 20-325 mesh; adding the mixed carrier powder in a tebuthiuron solution to obtain tebuthiuron-carrier powder mixed liquor; adding the tebuthiuron-carrier powder mixed liquor in an adhesive, continuously stirring the materials for 0.1-0.6 h until the materials are uniformly mixed; performing underpressure distillation on the tebuthiuron-carrier powder mixed liquor after being uniformly mixed with the adhesive, granulating the obtained solid to obtain the tebuthiuron-carrier powder particles; and performing reduced pressure distillation to recover the organic solvent to obtain the slow release-type tebuthiuron granular herbicide. The method has the following advantages that 1) the chemical and physical stability is good, massive decomposition of an original drug can be avoided; 2) security is good, pollution on environment is little, processing, storage and transport are convenient; and 3) tebuthiuron can be continuously and uniformly released to perform continuous weeds removing effect.

Description

technical field [0001] The invention belongs to the field of pesticides, and in particular relates to a preparation method of sustained-release buthiuron herbicide granules. Background technique [0002] In order to improve the safety of pesticide use and control the adverse effects of pesticides on the ecological environment, new pesticide formulations have developed rapidly in recent years. Compared with traditional pesticide formulations such as emulsifiable concentrates, the new pesticide formulations have the following advantages: 1) good environmental compatibility; 2) high content of active ingredients, small packaging volume, safe and convenient storage and transportation; 3) good formulation stability and strong adaptability of formulations , Applicable to liquid and solid raw materials. [0003] Tebuthiuron is commonly known as tebuthiuron, also known as tebuthiuron, and its chemical name is 1-(5-tert-butyl-1,3,4-thiadiazol-2-yl)-1,3-dimethylurea. Tebuthiauron te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/18A01N25/14A01N25/08A01N47/36A01P13/00
CPCA01N25/18A01N25/08A01N25/14A01N47/36
Inventor 温泰伟李有罗进超吕晓军汪强敏陶涛马海龙
Owner YANCHENG SOUTH CHEM
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